U.S. patent number 11,106,294 [Application Number 15/210,412] was granted by the patent office on 2021-08-31 for self-capacitance touch screen and display device having the same.
This patent grant is currently assigned to Samsung Display Co., Ltd.. The grantee listed for this patent is Samsung Display Co., Ltd.. Invention is credited to Seon Ki Kim.
United States Patent |
11,106,294 |
Kim |
August 31, 2021 |
Self-capacitance touch screen and display device having the
same
Abstract
A self-capacitance touch screen includes a plurality of sensing
electrodes; and sensing lines connected to the sensing electrodes,
wherein a number of sensing lines is smaller than a number of
sensing electrodes.
Inventors: |
Kim; Seon Ki (Yongin-si,
KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
Samsung Display Co., Ltd. |
Yongin-si |
N/A |
KR |
|
|
Assignee: |
Samsung Display Co., Ltd.
(N/A)
|
Family
ID: |
1000005773651 |
Appl.
No.: |
15/210,412 |
Filed: |
July 14, 2016 |
Prior Publication Data
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|
|
Document
Identifier |
Publication Date |
|
US 20170185184 A1 |
Jun 29, 2017 |
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Foreign Application Priority Data
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|
|
|
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Dec 28, 2015 [KR] |
|
|
10-2015-0187486 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G06F
3/0412 (20130101); G06F 3/044 (20130101); G06F
2203/04112 (20130101) |
Current International
Class: |
G06F
3/041 (20060101); G06F 3/044 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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103631464 |
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Mar 2014 |
|
CN |
|
103699256 |
|
Apr 2014 |
|
CN |
|
104133594 |
|
Nov 2014 |
|
CN |
|
204066077 |
|
Dec 2014 |
|
CN |
|
104571742 |
|
Apr 2015 |
|
CN |
|
10-1500330 |
|
Mar 2015 |
|
KR |
|
Other References
Machine translation of KR1015003300 provided in IDS into English;
Hong et al. (Year: 2015). cited by examiner .
Kim et al., Advanced In-cell Touch Technology for Large Sized
Liquid Crystal Displays, SID 2015 Digest, pp. 895-898, 60.2,
Paju-si, Gyeonggi-do, Republic of Korea. cited by applicant .
Ohinese Office Action Report, Application No. 201611069254.4 dated
Oct. 28, 2020, 9 pages. cited by applicant.
|
Primary Examiner: Butcher; Brian M
Attorney, Agent or Firm: Innovation Counsel LLP
Claims
What is claimed is:
1. A self-capacitance touch screen, comprising: a plurality of
sensing rows extending along a first direction, each of the
plurality of sensing rows including: a plurality of sensing
electrodes which include a plurality of sensing groups, each of the
plurality of sensing groups having at least two sensing electrodes
disposed adjacent to each other along the first direction and
having a same area, and a plurality of sensing lines extending
along the first direction, each of the plurality of sensing lines
being connected to only one sensing electrode in each of the
plurality of sensing groups, wherein a number of the plurality of
sensing lines in each of the plurality of sensing rows is the same
as a number of the sensing electrodes in each of the plurality of
sensing groups, and wherein the plurality of sensing electrodes are
provided on a same plane; and each of the sensing electrodes
individually senses a location of a touch.
2. The self-capacitance touch screen of claim 1, wherein the
sensing groups include a same number of sensing electrodes.
3. The self-capacitance touch screen of claim 2, wherein a
capacitance of a sensing electrode in one sensing group is
different from a capacitance of a sensing electrode in another
sensing group.
4. The self-capacitance touch screen of claim 3, wherein the
sensing groups include the plurality of sensing electrodes, and
capacitances of the sensing electrodes in each of the sensing
groups are same.
5. The self-capacitance touch screen of claim 2, wherein an area of
a sensing electrode in one sensing group is different from an area
of a sensing electrode in another sensing group.
6. The self-capacitance touch screen of claim 5, wherein the
sensing groups include the plurality of sensing electrodes, and the
areas of the sensing electrodes in each of the sensing groups are
same.
7. The self-capacitance touch screen of claim 6, wherein each of
the sensing electrodes includes a square shape having an opening
therein and area defined by outer edges of the square shape is
same, and an area of an opening of the sensing electrode in the one
sensing group is different from an area of an opening of a sensing
electrode in another sensing group.
8. The self-capacitance touch screen of claim 6, wherein the areas
of the sensing electrodes in one sensing group are different from
areas of sensing electrodes in another sensing group.
9. A self-capacitance touch screen, comprising: a plurality of
sensing electrodes disposed in a plurality of sensing rows or in a
plurality of sensing columns, each of the plurality of sensing
electrodes including a first region and a second region
electrically separated from each other and disposed adjacent to
each other along a first direction; and a first sensing line
extending along the first direction and connected to each of first
regions in the plurality of sensing electrodes and not connected to
the second region, and a second sensing line extending along the
first direction and connected to each of second regions in the
plurality of sensing electrodes and not connected to the first
region, wherein the plurality of sensing electrodes are provided on
a same plane, and each of the sensing electrodes individually
senses a location of a touch.
10. The self-capacitance touch screen of claim 9, wherein a sum of
areas of the first region and the second region in one sensing
electrode is the same as a sum of areas of the first region and the
second region in the other sensing electrodes.
11. The self-capacitance touch screen of claim 9, wherein a sum of
capacitances of the first region and the second region in one
sensing electrode is the same as a sum of capacitances of the first
region and the second region in the other sensing electrodes.
12. The self-capacitance touch screen of claim 9, wherein a number
of sensing lines connected to one sensing electrode is the same as
a number of regions in one sensing row or in one sensing
column.
13. The self-capacitance touch screen of claim 9, wherein a
capacitance of the first region in one sensing electrode is
different from a capacitance of a first region in another sensing
electrode, and a capacitance of the second region in one sensing
electrode is different from a capacitance of a second region in
another sensing electrode.
14. The self-capacitance touch screen of claim 9, wherein each of
the first regions of the sensing electrodes includes a square shape
having an opening and an area defined by outer edges of the square
shape is same, and an area of the opening in one sensing electrode
is different from an area of an opening in another sensing
electrode.
15. The self-capacitance touch screen of claim 14, wherein the
second region is disposed in the opening, and an area of the second
region in one sensing electrode is different from an area of a
second region in another sensing electrode.
16. A display device, comprising: a first substrate; a display
element disposed on the first substrate; a second substrate facing
to the first substrate; and a self-capacitance touch screen
disposed on one side of the second substrate, wherein the
self-capacitance touch screen includes a plurality of sensing rows
extending along a first direction, each of the plurality of sensing
rows including: a plurality of sensing electrodes which include a
plurality of sensing groups, each of the plurality of sensing
groups having at least two sensing electrodes disposed adjacent to
each other along the first direction and having a same area, and a
plurality of sensing lines extending along the first direction,
each of the plurality of sensing lines being connected to only one
sensing electrode in each of the plurality of sensing groups,
wherein a number of the plurality of sensing lines in each of the
plurality of sensing rows is the same as a number of the sensing
electrodes in each of the plurality of sensing groups, and wherein
the plurality of sensing electrodes are provided on a same plane
and each of the sensing electrodes individually senses a location
of a touch.
17. The display device of claim 16, wherein a capacitance of the
sensing electrode in one sensing group is different from a
capacitance of a sensing electrode in other sensing groups.
18. The display device of claim 16, wherein an area of the sensing
electrode in one sensing group is different from an area of a
sensing electrode in other sensing groups.
19. A display device, comprising: a first substrate; a display
element disposed on the first substrate; a second substrate facing
to the first substrate; and a self-capacitance touch screen
disposed on one side of the second substrate, wherein the
self-capacitance touch screen includes: a plurality of sensing
electrodes disposed in a plurality of sensing rows or in a
plurality of sensing columns, each of the plurality of sensing
electrodes including a first region and a second region
electrically separated from each other and disposed adjacent to
each other along a first direction; and a first sensing line
extending along the first direction and connected to each of first
regions in the plurality of sensing electrodes and not connected to
the second region, and a second sensing line extending along the
first direction and connected to each of second regions in the
plurality of sensing electrodes and not connected to the first
region, and wherein the plurality of sensing electrodes are
provided on a same plane, and each of the sensing electrodes
individually senses a location of a touch.
20. The display device of claim 19, wherein a sum of areas of the
first region and the second region in one sensing electrode is the
same as a sum of areas of the first region and the second region in
the other sensing electrodes.
21. The display device of claim 19, wherein a sum of capacitances
of the first region and the second region in one sensing electrode
is the same as a sum of capacitances of the first region and the
second region in the other sensing electrodes.
22. The display device of claim 19, wherein a number of sensing
lines connected to one sensing electrode is the same as a number of
regions in the sensing electrodes in one sensing row or in one
sensing column.
23. The display device of claim 19, wherein a capacitance of the
first region in one sensing electrode is different from a
capacitance of a first region in another sensing electrode, and a
capacitance of the second region in one sensing electrode is
different from a capacitance of a second region in another sensing
electrode.
24. A self-capacitance touch screen, comprising: a first sensing
group including a first sensing electrode and a second sensing
electrode adjacent to the first sensing electrode; a second sensing
group adjacent to the first sensing group in one direction and
including a third sensing electrode and a fourth sensing electrode
adjacent to the third sensing electrode; a first sensing line
connected to the first sensing electrode of the first sensing group
and the third sensing electrode of the second sensing group; and a
second sensing line connected to the second sensing electrode of
the first sensing group and the fourth sensing electrode of the
second sensing group, wherein the first sensing electrode and the
second sensing electrode have a first area, and the third sensing
electrode and the fourth sensing electrodes have a second area
which is different from the first area.
Description
RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. 119(a) to
Korean Patent Application No. 10-2015-0187486, filed on Dec. 28,
2015, in the Korean Intellectual Property Office, the entire
contents of which are incorporated herein by reference in their
entirety.
BACKGROUND
1. Field
An aspect of the present disclosure relates to a self-capacitance
touch screen and a display device having the same.
2. Description of the Related Art
A touch screen is an input device sensing a touch position of a
user and inputting a command of the user. The touch screen is
provided on the front of the display device, or integrated with the
display device.
Recently, a self-capacitance touch screen has been developed for
reducing a thickness of the touch screen. The self-capacitance
touch screen senses a change of a capacitance between electrodes
and detects the touch position when touched by a user's finger.
The self-capacitance touch screen includes a mutual capacitance
touch screen and as a self-capacitance touch screen.
The self-capacitance touch screen includes a plurality of touch
electrodes and sensing lines connecting each of the touch
electrodes to a touch sensing unit, and the number of touch
electrodes and the number of sensing lines are the same as each
other. The self-capacitance touch screen senses the touch position
of the user by sensing the changes of the capacitance formed in the
touch electrodes.
In the meantime, as the self-capacitance touch screen is enlarged,
the number of touch electrodes and the number of sensing lines
increase. In the self-capacitance touch screen, as the number of
sensing lines increases, light transmittance of the
self-capacitance touch screen is reduced.
SUMMARY
According to an aspect of the present disclosure, there is provided
a self-capacitance touch screen with a smaller number of sensing
lines than that of sensing electrodes.
According to another aspect of the present disclosure, there is
provided a display device including the self-capacitance touch
screen.
According to an embodiment, a self-capacitance touch screen may
comprise a plurality of sensing electrodes, and sensing lines
connected to the sensing electrodes, wherein the number of sensing
lines is smaller than the number of sensing electrodes.
The sensing electrodes may be disposed in a plurality of sensing
rows or in a plurality of sensing columns, and the plurality of
sensing rows or the plurality of sensing columns may include a
plurality of sensing groups having at least one sensing electrode,
and disposed in a row direction or a column direction
The sensing groups may include a same number of sensing
electrodes.
The number of sensing lines may be the same as the number of
sensing electrodes in each of the sensing groups.
A capacitance of a sensing electrode in one sensing group may be
different from a capacitance of a sensing electrode in another
sensing group.
The sensing groups may include a plurality of sensing electrodes,
and capacitances of the sensing electrodes in each of the sensing
groups are same.
An area of a sensing electrode in one sensing group may be
different from an area of a sensing electrode in another sensing
group.
The sensing groups may include a plurality of sensing electrodes,
and the areas of the sensing electrodes in each of the sensing
group may be same.
Each of the sensing electrodes may include a square shape having an
opening therein and area defined by outer edges of the square shape
is same, and an area of an opening of the sensing electrode in the
one sensing group is different from an area of an opening of a
sensing electrode in another sensing group.
The areas of the sensing electrodes in one sensing group may be
different from areas of sensing electrodes in another sensing
group.
The sensing electrodes may be disposed in a plurality of sensing
rows or in a plurality of sensing columns, and the sensing
electrodes may include a plurality of regions electrically
separated from one another.
A sum of areas of the regions in one sensing electrode may be the
same as a sum of areas of the regions in the other sensing
electrodes.
A sum of capacitances of the regions in one sensing electrode may
be the same as a sum of capacitances of the regions in the other
sensing electrodes.
A number of sensing lines may be the same as a number of regions in
one sensing row or in one sensing column.
The sensing electrodes may include a first region and a second
region electrically separated from the first region.
A capacitance of the first region in one sensing electrode may be
different from a capacitance of a first region in another sensing
electrode, and a capacitance of the second region in one sensing
electrode may be different from a capacitance of a second region in
another sensing electrode.
Each of the first regions of the sensing electrodes may include a
square shape having an opening and an area defined by outer edges
of the square shape is same, and an area of the opening in one
sensing electrode is different from an area of an opening in
another sensing electrode.
The second region may be disposed in the opening, and an area of
the second region in one sensing electrode may be different from an
area of a second region in another sensing electrode.
A display device may comprise a first substrate, a display element
disposed on the first substrate, a second substrate facing to the
first substrate, and a self-capacitance touch screen disposed on
one side of the second substrate, wherein the self-capacitance
touch screen includes: a plurality of sensing electrodes and
sensing lines connected the plurality of sensing electrodes, and
wherein a number of sensing lines is smaller than a number of
sensing electrodes.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plane view illustrating a self-capacitance touch screen
according to an embodiment of the present disclosure.
FIGS. 2, 3, 4 and 5 are plane views illustrating a self-capacitance
touch screen according to the other embodiments of the present
disclosure.
FIGS. 6, 7, 8, 9 and 10 are plane views illustrating a display
device including a touch screen shown in FIGS. 1 to 5.
DETAILED DESCRIPTION
Embodiments of the inventive concept will be described with
reference to the accompanying figures in detail.
FIG. 1 is a plane view illustrating a self-capacitance touch screen
according to an embodiment of the present disclosure.
Referring to FIG. 1, the self-capacitance touch screen includes a
sensing area SA and a non-sensing area NSA. The non-sensing area
NSA may be disposed to be adjacent to the sensing area SA. For
example, the non-sensing area NSA may surround the sensing area
SA.
The self-capacitance touch screen may include a plurality of
sensing electrodes TSE disposed in the sensing area SA, a plurality
of sensing lines SL1, SL2, and SL3 electrically connected to the
sensing electrodes TSE, and a pad unit PA including a plurality of
pads PD electrically connected to each of the sensing lines SL1,
SL2 and SL3 and disposed in the non-sensing area NSA.
The sensing electrodes TSE may be disposed in the sensing area SA.
In addition, the sensing electrodes TSE may be arranged in a matrix
shape. In other words, the sensing electrodes TSE may be disposed
in a plurality of sensing rows TC1, TC2, TC3, and TC4 or a
plurality of sensing lines SL1, SL2 and SL3. For example, the
sensing electrodes TSE may be disposed in a first sensing row TC1,
a second sensing row TC2, a third sensing row TC3, and a fourth
sensing row TC4 disposed in a row direction.
The sensing electrodes TSE disposed in the sensing rows TC1, TC2,
TC3, and TC4 may be classified as a plurality of sensing groups
TG1, TG2 and TG3 including at least one sensing electrode TSE. For
example, the sensing rows TC1, TC2, TC3, and TC4 may include a
first sensing group TG1, a second sensing group TG2, and a third
sensing group TG3, and each sensing group TG1, TG2, and TG3 may
include three sensing electrodes TSE in the same sensing row.
An area of the sensing electrodes TSE of each of sensing group TG1,
TG2, and TG3 may be the same as one another. An area of the sensing
electrodes TSE of one of the sensing groups TG1, TG2, and TG3 may
be different from an area of the sensing electrodes TSE of another
of the sensing groups TG1, TG2, and TG3. Accordingly, the sensing
electrodes TSE of the sensing groups TG1, TG2, and TG3 may have a
self-capacitance different from one another. For example, the
sensing electrodes TSE disposed in the first sensing group TG1 may
have a first self-capacitance Cs1, and the sensing electrode TSE
disposed in the second sensing group TG2 may have a second
self-capacitance Cs2, and the sensing electrodes TSE disposed in
the third sensing group TG3 may have a third self-capacitance
Cs3.
In addition, the sensing electrodes TSE may be a square shape
having the same area, and include an opening OA disposed inside of
the square shape.
The sensing electrodes TSE of the same sensing group TG1, TG2, and
TG3 may have the same area. Further, an area of the opening OA of
the sensing electrodes TSE of one of the sensing groups TG1, TG2,
and TG3 may be different from an area of the opening OA of the
sensing electrodes TSE of the other sensing groups TG1, TG2, and
TG3. However, the sensing electrodes TSE in one of the sensing
groups TG1, TG2, and TG3 may not have the opening OA.
The sensing electrodes TSE may include conductive material that
transmits light. For example, the sensing electrodes TSE may
include indium tin oxide (ITO), indium zinc oxide (IZO), aluminum
zinc oxide (AZO), gallium doped zinc oxide (GZO), zinc tin oxide
(ZTO), gallium tin oxide (GTO) and at least one transparent
conductive oxide of fluorine doped tin oxide (FTO).
In addition, the sensing electrodes TSE may include a metal mesh.
In more detail, the sensing electrodes TSE may include a plurality
of conductive lines which intersect one another. The conductive
lines may include a plurality of first lines extended in one
direction, and a plurality of second lines extended in a direction
which intersects the first lines.
The sensing lines SL1, SL2 and SL3 may be connected to the pads PD.
The sensing lines SL1, SL2, and SL3 may include metal material
having excellent electroconductivity. For example, the sensing
lines SL1, SL2, and SL3 may include at least one of silver (Ag),
gold (Au), platinum (Pt), cooper (Cu), molybdenum (Mo), aluminum
(Al), and alloy thereof.
The number of sensing lines SL1, SL2, and SL3 may be smaller than
the number of sensing electrodes TSE in the same sensing row. For
example, the number of sensing lines SL1, SL2, and SL3 disposed in
one of the sensing rows TC1, TC2, TC3 and TC4, among the sensing
rows TC1, TC2, TC3 and TC4, may be identical to the number of
sensing electrodes TSE included in the sensing groups TG1, TG2 and
TG3.
When the sensing groups TG1, TG2, and TG3 include three sensing
electrodes TSE, a first sensing lines SL1, a second sensing line
SL2, and a third sensing line SL3 may be included in the sensing
rows TC1, TC2, TC3 and TC4.
The sensing lines SL1, SL2, and SL3 may contact one of the sensing
electrodes TSE in the sensing groups TG1, TG2, and TG3. For
example, the first sensing line SL1 may contact one of the sensing
electrodes TSE in each of the first to third sensing groups TG1 to
TG3. The second sensing lines SL2 may contact another sensing
electrode TSE in each of the first to third sensing groups TG1 to
TG3. The third sensing line SL3 may contact the other one of the
sensing electrodes TSE in each of the first to third sensing groups
TG1 to TG3. Each of the sensing lines SL1, SL2, and SL3 may contact
every three sensing electrodes TSE in the same sensing row when the
number of sensing electrode in the sensing groups is three. In
other words, when there are M sensing lines in the sensing row, the
sensing line may contact every M sensing electrodes TSE in the same
sensing row.
The self-capacitance touch screen may sense the touch position of
the user as below.
When the touch does not occur, a self-capacitance Ctotai measured
by the first sensing lines SL1, the second sensing lines SL2, and
the third sensing line SL3 may be equation 1 as below.
C.sub.total=Cs.sub.1+Cs.sub.2-Cs.sub.3 [Equation 1]
Wherein, CS1 is a self-capacitance measured by the first sensing
lines SL1, CS2 is a self-capacitance measured by the first sensing
lines SL2, and 3 is a self-capacitance measured by the first
sensing lines SL3.
When the touch occurs in the first sensing group TG1, a
self-capacitance Ctotal' measured by the first sensing lines SL1,
the second sensing lines SL2, and the third sensing line SL3 is
equation 2 as below.
C.sub.tota'=C.sub.S1+.DELTA.C.sub.S1+C.sub.S2+C.sub.S3 [Equation
2]
When the touch occurs in the second sensing group TG2, a
self-capacitance Ctotal' measured by the first sensing lines SL1,
the second sensing lines SL2, and the third sensing line SL3 is
equation 3 as below.
C.sub.total'=C.sub.S1+C.sub.S2+.DELTA.C.sub.S2+C.sub.S3 [Equation
3]
When the touch occurs in the third sensing group TG3, a
self-capacitance Ctotal' measured by the first sensing lines SL1,
the second sensing lines SL2, and the third sensing line SL3 is
equation 4 as below.
C.sub.total'=C.sub.S1+C.sub.S2+C.sub.S3+.DELTA.C.sub.S3 [Equation
4]
When the sensing rows TC1, TC2, TC3 and TC4 include N sensing
groups and the user's touch occurs in n.sup.th sensing group, a
self-capacitance Ctotal' measured by the first sensing lines SL1,
the second sensing lines SL2, and the third sensing line SL3 is
equation 5 as below. C.sub.total'=Cs.sub.1+Cs.sub.2+Cs.sub.3+ . . .
+.DELTA.Cs.sub.8 [Equation 5]
The sensing group TG1, TG2, and TG3 touched by measuring a
variation of the self-capacitance transmitted through the sensing
lines SL1, SL2, and SL3 may be identified. For example, when a
variation of the self-capacitance transmitted through the sensing
lines SL1, SL2, and SL3 is .DELTA.Cs1, it is considered that the
user's touch occurs in the first sensing group TG1 because each
sensing groups has different variation of the self-capacitance when
touch event is occurred in the sensing group.
In addition, the sensing electrode TSE touched in each sensing
group TG1, TG2, and TG3 may be identified by checking the sensing
lines SL1, SL2, and SL3 in which the change of the self-capacitance
occurs. For example, when the change of the self-capacitance is
sensed in the first sensing line SL1, it is considered that the
user's touch occurs in one of the sensing electrodes TSE connected
to the first sensing line SL1, among the sensing electrodes TSE in
the sensing groups TG1, TG2, and TG3. Accordingly, the sensing
electrode TSE in which the user's touch occurs may be considered to
be the sensing electrode TSE connected to the first sensing line
SL1 in the first sensing group TG1.
The self-capacitance touch screen may include a smaller number of
sensing lines SL1, SL2, and SL3 than the number of sensing
electrodes TSE. Accordingly, even though the self-capacitance touch
screen is enlarged, the self-capacitance touch screen may prevent
reduction of light transmittance by the sensing lines SL1, SL2, and
SL3.
Hereafter, another embodiment of the present disclosure shown in
FIGS. 2 to 10 is now described. In FIGS. 2 to 10, a constituent
element same as the constituent element illustrated in FIG. 1 has
the same numeral reference, and the description thereof will be
explained briefly. In addition, in order to avoid duplicate
explanation, features different from FIG. 1 will be described.
FIG. 2 is a plane view illustrating a display device including a
self-capacitance touch screen according to another embodiment of
the present disclosure.
Referring to FIG. 2, the self-capacitance touch screen may include
a plurality of sensing electrodes TSE disposed in the sensing area
SA, a plurality of sensing lines SL1, SL2, and SL3 electrically
connected to the sensing electrodes TSE, and a pad unit PA
including a plurality of pads PD electrically connected to each of
the sensing lines SL1, SL2 and SL3 and disposed in the non-sensing
area NSA.
The sensing electrodes TSE may be disposed in the matrix shape. In
other words, the sensing electrodes TSE may be disposed in the
plurality of sensing rows TC1, TC2, TC3, and TC4 or in the
plurality of sensing lines.
In addition, the sensing electrodes TSE disposed in the sensing
rows TC1, TC2, TC3, and TC4 may be classified as the plurality of
sensing groups TG1, TG2 and TG3 including at least on sensing
electrode TSE
The sensing electrodes TSE of each sensing group TG1, TG2, and TG3
may include the square shape with the same area. Further, an area
of the sensing electrodes TSE of one of the sensing groups TG1,
TG2, and TG3 may be different from an area of the sensing
electrodes TSE of the other sensing groups TG1, TG2, and TG3. For
example, the sensing electrodes TSE close to the pads PD may have
smaller area than the sensing electrodes TSE far away from the pads
PD. Therefore, the sensing electrodes TSE of each sensing group
TG1, TG2, and TG3 may have a different capacitance.
The sensing electrodes TSE may be connected to the pads PD through
the sensing lines SL1, SL2, and SL3. In addition, the number of
sensing lines SL1, SL2, and SL3 may be smaller than that of the
sensing electrodes TSE.
FIG. 3 is a plane view illustrating self-capacitance touch screen
according to another embodiment of the present disclosure.
Referring to FIG. 3, the self-capacitance touch screen may include
a plurality of sensing electrodes TSE disposed in the sensing area
SA, a plurality of sensing lines SL1, SL2, and SL3 electrically
connected to the sensing electrodes TSE, and a pad unit PA
including a plurality of pads PD electrically connected to each of
the sensing lines SL1, SL2 and SL3 and disposed in the non-sensing
area NSA.
The sensing electrodes TSE may be disposed in the matrix shape. In
other words, the sensing electrodes TSE may be disposed in the
plurality of sensing rows TC1, TC2, TC3, and TC4 or the plurality
of sensing lines.
In addition, the sensing electrodes TSE disposed in the sensing
rows TC1, TC2, TC3, and TC4 may be classified as the plurality of
sensing groups TG1, TG2 and TG3 including at least on sensing
electrode TSE
Areas of the sensing electrodes TSE of each of the sensing groups
TG1, TG2 and TG3 may be the same as one another. Further, an area
of the sensing electrodes TSE of one of the sensing groups TG1,
TG2, and TG3 may be different from an area of a sensing electrode
TSE of another of the sensing groups TG1, TG2, and TG3. Therefore,
the sensing electrodes TSE of each of the sensing groups TG1, TG2,
and TG3 may have a different capacitance from one another.
The sensing electrodes TSE may have the square shape. In addition,
the sensing electrodes TSE of a part of the sensing groups TG1,
TG2, and TG3 may include the openings OA, and the sensing
electrodes TSE of the remaining of the sensing groups TG1, TG2, and
TG3 may not include the openings OA.
The sensing electrodes TSE may contact the pads PD through the
sensing lines SL1, SL2, and SL3. In addition, the number of sensing
lines SL1, SL2, and SL3 may be smaller than that the number of
sensing electrodes TSE.
FIGS. 4 and 5 are plane views illustrating the self-capacitance
touch screen according to the other embodiments of the present
disclosure.
Referring to FIGS. 4 and 5, the self-capacitance touch screen may
include a plurality of sensing electrodes TSE disposed in the
sensing area SA, a plurality of sensing lines SL1 and SL2
electrically connected to the sensing electrodes TSE, and a pad
unit PA including a plurality of pads PD electrically connected to
each of the sensing lines SL1 and SL2, and disposed in the
non-sensing area NSA.
The sensing electrodes TSE may be disposed in the matrix shape. In
other words, the sensing electrodes TSE may be L (L is a natural
number more than two) sensing rows TC1, TC2, TC3, and TC4 or L
sensing lines.
The sensing electrodes TSE disposed in the sensing rows TC1, TC2,
TC3, and TC4 may include a plurality of regions TSE1 and TSE2
electrically separated from each other. In the sensing electrode
TSE, a sum of areas of the regions TSE1 and TSE2 of one sensing
electrode TSE may be the same as a sum of areas of the regions TSE1
and TSE2 of the other sensing electrode TSE. In addition, a sum of
capacitances of the regions TSE1 and TSE2 of one sensing electrode
TSE may be the same as a sum of capacitances of the regions TSE1
and TSE2 of the other sensing electrode TSE. For example, the
sensing electrode TSE may include a first region TSE1 and a second
region TSE2 electrically separated from each other. In the sensing
electrodes TSE, a sum of areas of the first region TSE1 and the
second region TSE2 of one sensing electrode TSE may be the same as
a sum of areas of the regions TSE1 and TSE2 of the other sensing
electrode TSE. In addition, a sum of capacitances of the first
region TSE1 and the second region TSE2 of one sensing electrode TSE
may be the same as a sum of capacitances of the regions TSE1 and
TSE2 of the other sensing electrode TSE.
The first region TSE1 and the second region TSE2 may have various
configurations. For example, as shown in FIG. 4, the first region
TSE1 of the sensing electrodes TSE may be the square shape and the
area defined by outer edges of the square shape is same, and the
openings OA may be included inside of the first region TSE1. An
area of the openings OA of the first region TSE1 of one sensing
electrode TSE may be different from an area of the first region
TSE1 of another sensing electrode TSE. The second region TSE2 may
be disposed in the opening OA. An area of the second region TSE2 of
one sensing electrode TSE may be different from an area of the
second region TSE2 of another sensing electrode TSE. For example,
the openings OA close to the pads PD may have greater area than the
sensing electrodes TSE far away from the pads PD. The sensing line
SL1 is connected to the plurality of first regions TSE1 and the
sensing line SL2 is connected to the plurality of first regions
TSE2.
In addition, as shown in FIG. 5, the first region TSE1 and the
second regions TSE2 may have the square shape which divides the
sensing electrodes TSE to be from side to side. The area of the
first region TSE1 of one sensing electrode TSE may be different
from the area of the first region TSE1 of another sensing electrode
TSE. In addition, the area of the second region TSE2 of one sensing
electrode TSE may be different from the area of the second region
TSE2 of another sensing electrode TSE. For example, the first
region TSE1 close to the pads PD may have smaller area than the
first region TSE1 far away from the pads PD and the second region
TSE2 close to the pads PD may have greater area than the second
region TSE2 far away from the pads PD.
The first region TSE1 of each sensing electrode TSE may contact the
first sensing line SL1, and the second region TSE2 may contact the
second line SL2. Accordingly, two sensing lines SL1 and SL2 may be
necessary in one of the sensing rows TC1, TC2, TC3 and TC4.
The self-capacitance touch screen may sense the touch position of
the user as follows.
In the sensing electrode TSE disposed in each sensing row TC1, TC2,
TC3 and TC4, a capacitance of the first region TSE1 may be defined
as Cs1P (P is a natural number more than 1), and a capacitance of
the second region TSE2 may be defined as Cs2P (P is a natural
number more than 1).
When the touch does not occur, the capacitance Ctotal measured
through the first sensing line SL1 and the second sensing line SL2
may be equation 6 and equation 7 as follows.
C.sub.1total=Cs.sub.11+Cs.sub.12+Cs.sub.13+ . . . +Cs.sub.1P
[Equation 6] C.sub.2total=Cs.sub.21+Cs.sub.22+Cs.sub.23+ . . .
+Cs.sub.2P [Equation 7]
In addition, when the touch does not occur in the first region TSE1
of p.sup.th sensing electrode TSE, the capacitances C1total' and
C2total' measured through the first sensing line SL1 and the second
sensing line SL2 may be equation 8 and equation 9 as follows.
C.sub.1total'=C.sub.S11+C.sub.S12+C.sub.S13+ . . .
+C.sub.S1P+.DELTA.C.sub.S1P [Equation 8]
C.sub.2total'=C.sub.S21+C.sub.S22+C.sub.S23+ . . .
+C.sub.S2P+.DELTA.C.sub.S2P [Equation 9]
In other words, the sensing electrode TSE touched by measuring the
variation of the capacitance transmitted through the sensing lines
SL1 and SL2 may be identified.
In addition, touch sensitivity may be improved since the change of
the capacitance is sensed in the first region TSE1 and the second
region TSE2 of the sensing electrodes TSE.
FIGS. 6 and 7 are plane views illustrating a display device
including a touch screen shown in FIGS. 1 to 5.
Referring to FIGS. 6 and 7, the display device may include a touch
screen comprising a first substrate 100, a display element 300
disposed on the first substrate 100, a second substrate 200
opposite to the first substrate 100, an encapsulant 400 attaching
the first substrate 100 to the second substrate 200, and the
plurality of sensing electrodes TSE disposed on one side of the
second substrate 200.
The first substrate 100 may be a thin film transistor substrate
comprising at least one thin film transistor (not shown.)
The display element 300 may be disposed on the first substrate 100
and electrically connected to the thin film transistor. The display
elements 300 may be at least one of a liquid crystal display device
(LCD device), an electrophoretic display device (EPD device), an
electrowetting display device (EWD device), and an organic light
emitting display device (OLED device.)
The second substrate 200 may be attached to the first substrate 100
and render the display element 300 to be isolated from an external
environment.
The sensing electrodes TSE of the touch screen may include the
shape shown in FIGS. 1 to 5. In addition, the sensing electrodes
TSE may be disposed on one side of the second substrate 200.
The display device may include one of an on-cell type touch screen
display device or an in-cell type touch screen display device. For
example, as shown in FIG. 6, when the sensing electrodes TSE are
disposed on an outer face of the second substrate 200, the display
device may be the on-cell type touch screen display device. In
addition, as shown in FIG. 7, when the sensing electrodes TSE are
disposed on a side opposite to the first substrate 100 of the
second substrate 200, the display device may be the in-cell type
touch screen display device.
In the meantime, in the in-cell type touch screen display device,
the touch screen may be integrated with the display element 300.
The display device in which the touch screen is integrated with the
display element 300.
FIGS. 8 and 9 are plane views illustrating a display device
according to other embodiments of the present disclosure.
Referring to FIGS. 8 and 9, the touch screen may be provided in the
display device, and the touch screen may sense the touch position
of the user.
In addition, the display device may include the first substrate
100, the second substrate 200 opposite to the first substrate 100,
and the display elements 300 disposed between the first substrate
100 and the second substrate 200
Of one of the first substrate 100 and the second substrate 200, for
example, the first substrate 100 may include a gate line, a data
line intersecting the gate line, and at least one thin film
transistor contacting the gate line and the data line.
The display element 300 may be a liquid crystal display element
integrated with the touch screen.
For example, as shown in FIG. 8, the display element 300 may
include first electrodes FE disposed in the plurality of pixel
regions of the first substrate 100, respectively, second electrodes
SE disposed on the second substrate 200 and opposite to the first
electrodes FE, and a liquid crystal layer LC disposed between the
first electrodes FE and the second electrodes SE.
The first electrode FE may contact the thin film transistor. In
addition, the second electrode SE may include a plurality of
electrode patterns. The electrode patterns may correspond to the
plurality of first electrodes FE. When a power is applied to the
first electrode FE and the second electrode SE, the first electrode
FE and the second electrode SE may form a vertical alignment,
liquid crystal molecules included in the liquid crystal layer LC
may be controlled.
In addition, as shown in FIG. 9, the display elements 300 may
include the first electrode FE disposed on the first substrate 100,
an insulating layer IL covering the first electrode FE, and the
second electrodes SE disposed on the insulating layer IL, and the
crystal layer LC disposed between the second electrodes SE and the
second substrate 200.
The first electrode FE may include the plurality of electrode
patterns. The second electrodes SE may contact the thin film
transistor. Each of the second electrodes SE may include a
plurality of slits (not shown.) Accordingly, when a power is
applied to the first electrode FE and the second electrode SE, the
first electrode FE and the second electrode SE may form in plane
alignment, and the liquid crystal molecules included in the crystal
layer LC may be controlled.
The electrode patterns may be connected to sensing lines (not
shown) and sense the user's touch. The sensing lines may be
disposed in alignment with one of the gate line and the data line.
A common power signal or a touch sensing signal may be applied in
the electrode patterns through the sensing lines. That is, when the
common power signal is applied to the electrode patterns, the
electrode patterns may perform as a common electrode of the crystal
display device. In addition, when the touch sensing signal is
applied to the electrode patterns, the electrode patterns may
perform as the sensing electrode of the touch screen.
In the meantime, the electrode patterns may have the same shape as
the sensing electrodes in FIGS. 4 and 5. That is, the electrode
patterns may include the first region TSE1 and the second region
TSE2 electrically separated from each other. The touch sensing
signal and the common power signal may be alternately applied to at
least one of the first region TSE1 and the second region TSE2.
For example, the touch sensing signal and the common power signal
may be alternately applied to the first region TSE1, and the common
power signal may be applied to the second region TSE2. Accordingly,
the first region TSE1 may perform as a common electrode of the
liquid crystal display element and the touch sensing electrode, and
the second region TSE2 may perform as the common electrode of the
liquid crystal display element.
In addition, the touch sensing signal and the common power signal
may be alternately applied to the first region TSE1 and the second
region TSE2. Accordingly, the first region TSE1 and the second
region TSE2 may perform the common electrode of the crystal display
device and the touch sensing electrode.
In addition, since the change of the capacitance may be sensed in
the first region TSE1 and the second region TSE2 of the sensing
electrodes TSE, touch sensitivity of the touch screen may be
improved.
FIG. 10 is a plane view illustrating a display device according to
another embodiment of the present disclosure.
Referring to FIG. 10, the display device may include the first
substrate 100, the second substrate 200 opposite to the first
substrate 100, and the display element 300 disposed between the
first substrate 100 and the second substrate 200.
Of one of the first substrate 100 and the second substrate 200, for
example, the first substrate 100 may include the gate line, the
data line intersecting the gate line, and at least one thin film
transistor contacting the gate line and the data line.
The display element 300 may be an organic light emitting display
element integrated with the touch screen. For example, the display
element 300 may include first electrodes AE disposed in the
plurality of pixel regions on the first substrate 100, an organic
layer OL disposed on the first electrodes AE, and second electrode
CE disposed on the organic layer OL.
At least one of the first electrode AE and the second electrode CE
may be an anode electrode, and another one is a cathode electrode.
For example, the first electrode AE may be the anode electrode, and
the second electrode CE may be the cathode electrode.
In addition, at least one of the first electrode AE and the second
electrode CE may be a transmissive type electrode. For example,
when the display element is a bottom emission type organic light
emitting element, the first electrode AE may be the transmissive
type electrode, and the second electrode CE may be a reflective
type electrode. When the display element is a top emission type
organic light emitting element, the first electrode AE may be the
reflective type electrode, and the second electrode CE may be the
transmissive type electrode. When the display device is a
double-sided emission type organic light emitting element, the
first electrode AE and the second electrode CE may the transmissive
type electrodes. In an embodiment, the top emission type organic
light emitting element will be described as an example of the
display element.
In each pixel region, the first electrode AE may be disposed on the
first substrate 100. The first electrode AE may include a
reflective film (not shown) reflecting light and a transparent
conductive film (not shown) disposed in the above below the
reflective film. At least one of the transparent conductive film
and the reflective film may contact the drain electrode DE.
The reflective film may include material which reflects the light.
For example, the reflective film may include at least one of
aluminum (AL), silver (Ag), molybdenum (Mo), platinum (Pt), Nickel
(Ni) and alloy thereof.
The transparent conductive film may include transparent conductive
oxide. For example, the transparent conductive layer may include
one of include indium tin oxide (ITO), indium zinc oxide (IZO),
aluminum zinc oxide (AZO), gallium doped zinc oxide (GZO), zinc tin
oxide (ZTO), gallium tin oxide (GTO) and at least one transparent
conductive oxide of fluorine doped tin oxide (FTO).
The organic layer OL may include a multi-layer thin film structure
including at least one light emitting layer. For example, the
organic layer OL may include a hole injection layer (HIL) in which
a hole is injected, a hole transport layer (HTL) with excellent
transporting of holes and increasing recombination opportunity of
hole and electron by suppressing movement of the electron, a light
emitting layer (EML) emitting the light by the recombination of the
injected electron and the injected hole, a hole blocking layer
(HBL) suppressing the movement of the hole which is not combined on
the light emitting layer (EML), an electron transport layer (ETL)
to easily transport the electron to the light emitting layer (EML),
an electron injection layer (EIL) in which the electron is
injected.
The hole injection layer (HIL), the hole transport layer (HTL), the
hole blocking layer (HBL), the electron transport layer (ETL), the
electron injection layer (EIL) may be the common layer connected to
the pixel regions adjacent to each other.
Color of light generated on the light emitting layer ELM may be one
of red, green, blue, and white, but it is not limited thereto. For
example, the color of the light generated on the light emitting
layer ELM on the organic layer OL may be one of magenta, cyan, and
yellow.
The second electrode CE may be disposed on the organic layer OL.
The second electrode CE may be a transflective film. That is, the
second electrode CE may transmit a part of the light generated on
the light emitting layer (ELM), and reflect remaining light
generated on the light emitting layer (ELM). For example, the
second electrode CE may be a thin film metal layer thin enough to
transmit the light.
The second electrode CE may include a lower work function material
than the transparent conductive layer. For example, the second
electrode CE may include molybdenum (Mo), tungsten (W), silver
(Ag), aluminum (AL), platinum (Pt), palladium (Pd), gold (Au),
nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium
(Li), and calcium (Ca).
The part of the light emitted on the organic layer OL may not
transmit the second electrode CE, and the light reflected from the
second electrode CE may be reflected from the first electrode AE
which is a reflective layer. That is, the light emitted on the
organic layer OL may resonate between the first electrode AE and
the second electrode CE. Light extraction efficiency of the display
element may be improved by resonation of the light.
In addition, the second electrode CE may include the plurality of
electrode patterns overlapping the part of the pixel regions. The
electrode patterns may have the same shape as the sensing
electrodes in FIGS. 1 to 5.
As described above, the self-capacitance touch screen may include a
smaller number of sensing lines than the number of sensing
electrodes. Accordingly, even though the self-capacitance touch
screen is enlarged, reduction of light transmission by the sensing
lines may be prevented.
In addition, a display device including a self-capacitance touch
screen may prevent lowering display quality caused by reduction of
light transmission.
Embodiments are provided to more sincerely and fully disclose the
inventive concept and to completely transfer the spirit of the
inventive concept to those skilled in the art to which the
inventive concept pertains, and the scope of the inventive concept
should be understood by the claims of the inventive concept.
Accordingly, it will be understood by those of skill in the art
that various changes in form and details may be made without
departing from the spirit and scope of the inventive concept as set
forth in the following claims. Accordingly, it will be understood
by those of skill in the art that various changes in form and
details may be made without departing from the spirit and scope of
the present inventive concept as set forth in the following claims.
Therefore, the technical range of the present inventive concept is
not limited to the detailed description of the specification but
defined by the range of the claims.
* * * * *